*{
    margin: 0;
    padding: 0;
}

.top{
    height: 50px;
    background-color: gray;
}

.banner{
    width: 980px;
    height: 150px;
    background-color: gray;
    margin: 10px auto;
}

li {
    list-style: none;
}

.box{
    width: 980px;
    margin: 0 auto;
    height: 300px;
    background-color: pink;
}

.box li {
    float: left;
    width: 237px;
    height: 300px;
    background-color: gray;
    margin-right: 10px;
}

.box .last {
    margin-right: 0;
}

.footer {
    height: 200px;
    background-color: gray;
    margin-top: 5px;
}